/*
 * Copyright 1999-2011 Alibaba Group.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.winit.cloudlink.registry;

import java.net.NetworkInterface;
import java.net.SocketException;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

/**
 * PerformanceUtils
 *
 * @author william.liangf
 */
public class PerformanceUtils {

	public static String getProperty(String key, String defaultValue) {
		String value = System.getProperty(key);
		if (value == null || value.trim().length() == 0 || value.startsWith("$")) {
			return defaultValue;
		}
		return value.trim();
	}

	public static int getIntProperty(String key, int defaultValue) {
		String value = System.getProperty(key);
		if (value == null || value.trim().length() == 0 || value.startsWith("$")) {
			return defaultValue;
		}
		return Integer.parseInt(value.trim());
	}

	public static boolean getBooleanProperty(String key, boolean defaultValue) {
		String value = System.getProperty(key);
		if (value == null || value.trim().length() == 0 || value.startsWith("$")) {
			return defaultValue;
		}
		return Boolean.parseBoolean(value.trim());
	}

	public static List<String> getEnvironment() {
		List<String> environment = new ArrayList<String>();
		environment.add("OS: " + System.getProperty("os.name") + " " + System.getProperty("os.version") + " " + System.getProperty("os.arch", ""));
		environment.add("CPU: " + Runtime.getRuntime().availableProcessors() + " cores");
		environment.add("JVM: " + System.getProperty("java.vm.name") + " " + System.getProperty("java.runtime.version"));
		environment.add("Memory: " + DecimalFormat.getIntegerInstance().format(Runtime.getRuntime().totalMemory())
				+ " bytes (Max: " + DecimalFormat.getIntegerInstance().format(Runtime.getRuntime().maxMemory()) + " bytes)");
		NetworkInterface ni = PerformanceUtils.getNetworkInterface();
		if (ni != null) {
			environment.add("Network: " + ni.getDisplayName());
		}
		return environment;
	}

	private static final int WIDTH = 64;

	public static void printSeparator() {
		StringBuilder pad = new StringBuilder();
		for (int i = 0; i < WIDTH; i++) {
			pad.append("-");
		}
		System.out.println("+" + pad + "+");
	}

	public static void printBorder() {
		StringBuilder pad = new StringBuilder();
		for (int i = 0; i < WIDTH; i++) {
			pad.append("=");
		}
		System.out.println("+" + pad + "+");
	}

	public static void printBody(String msg) {
		StringBuilder pad = new StringBuilder();
		int len = WIDTH - msg.length() - 1;
		if (len > 0) {
			for (int i = 0; i < len; i++) {
				pad.append(" ");
			}
		}
		System.out.println("| " + msg + pad + "|");
	}

	public static void printHeader(String msg) {
		StringBuilder pad = new StringBuilder();
		int len = WIDTH - msg.length();
		if (len > 0) {
			int half = len / 2;
			for (int i = 0; i < half; i++) {
				pad.append(" ");
			}
		}
		System.out.println("|" + pad + msg + pad + ((len % 2 == 0) ? "" : " ") + "|");
	}

	public static NetworkInterface getNetworkInterface() {
		try {
			Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
			if (interfaces != null) {
				while (interfaces.hasMoreElements()) {
					try {
						return interfaces.nextElement();
					} catch (Throwable e) {
					}
				}
			}
		} catch (SocketException e) {
		}
		return null;
	}

}